Hi everyone , i need your advice about a sat nav , looking to get a new one soon have been looking at the Avtex tourer 2 cmc version , i know it's a garmin with another name but is it any good or do i go for the Garmin 770, hope to get some discount at Event city Motorhome show next month, not keen on the Tom Tom ones a bit small for me , so i'm all ear's .